Steam vacuum-pump



UNITED STATES PATENT OEEICE.

GEORGE H. NYE, OF CHICAGO, ILLINOIS.

STEAM vAuuM-PUMP.

SPECIFICATION forming part of Letters Patent No. 263,803, datedSeptember 5,.,1882.

Application lcd J annary 2S, 1882. (No model.)

To all whom 'it may concer/n Be it known that I, GEORGE H. NYE, ofChicago,in the county of Cook and State of Illinois, have invented a newand useful Improvement in Steam Vacuum-Pumps, of which the following isa specification, reference being had to the accompanying drawings,illustrating the invention, in which- Figure'I represents the bottom ofa steam vacuum-pump embodying my improvement; Fig. II, a brokenelevation thereof; Fig. III,

i a section of the bottom on line z, Fig. I.

The present invention relates to an improvement on the steam vacuum-pumppatented to me on December 15,1874., No. 157 ,863.

The invention consists in a chamber communicating with thepump-cylinders and the discharge-chamber. The benefit to be attained bythis connectingchamber is as follows: When raising water in the wintermonths the pump as patented will throw' a large bodylof water into areservoir above. `After such an elevation it becomes necessary to freethe pump as a whole to avoid damage by frost acting on the watertherein. This was done by shutting a valve to hold the water in the tankabove, and then, by cocks in the various passages in the pump, drainingoff the water, involving the necessity of priming at each time the pumpwas to be put in operation after such drainage. My present improvementavoids such priming in that by opening a cock, J, which controls thecommunication of the pum p-cylinders with discharge -chamber I by meansof' my new chamber a', the water will pass into both pumpcylinders, andthus leave the pump primed for use. rlhe chamber .fr is also anadditional element ofconvenience in low lifts-that is, where water is tobe raised to the height of the pump.

A A represent the pump-cylinders, B the base plate, I thedischarge-chamber, and K the condenser, of the patented pump referredto; G, the induction-pipe; H H', its branches. t' 'i are the pipes whichcommunicate with the pump-cylinders and discharge-chamber. L L are thepipes which communicate with the condenser and pump-cylinders, and M M'are the small ducts leading from the pump-cylinders A A to thecondensereylinder. P P are pipes connected with the valve-movement, allof which are shown to be old in the said patent.

My improvement consists of a chamber, a', Fig. III, and valve or cutoffJ, the plan form of the chamber being shown at .fr a: m, Fig. I.

In practice the base-plate Bis extended down, as shown at It, and coredout to form the chamber w. The valve J controls the communication of thepump-cylinders with the dischargechamber I, and when said cock is closedthere remains a free communication between the pump-cylinders A A bymeans of the ports J' J and the chamber fr. This, to my knowledge, hasnot been before successfully done in steam vacuum-pumps.

vantage on pumps which take water after the dischargethat is, after thewater has passed the discharge-valve--inasmuch as the inc oming Water isintroduced colder, and therefore produces a more nearly perfect vacuum.It is true that in most pumps of this kind the warmer Water is at thetop of the column, where it comes in contact Withthe steam, and that itis the last to leave the cylinders, and that it is desirable to replaceit with cold Water to produce a working-vacuum; hence the importance ofa direct communication between the cylinders A A. y

I claim- The chamber an, communicating with the chamber I bymeans of thevalve J and with the cylinders AA by means ot' ports J J', as and forthe purpose set forth.

GEORGE H. NYE. Witnesses:

J. S. HUET, G. L. CHAPIN.

My improvement can be used to a great ad'

